CN102547490B - A kind of method and system of connection establishment - Google Patents
A kind of method and system of connection establishment Download PDFInfo
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- CN102547490B CN102547490B CN201010607256.0A CN201010607256A CN102547490B CN 102547490 B CN102547490 B CN 102547490B CN 201010607256 A CN201010607256 A CN 201010607256A CN 102547490 B CN102547490 B CN 102547490B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1652—Optical Transport Network [OTN]
Abstract
The present invention discloses a kind of method and system of connection establishment, wherein, described method comprises: the first node of business initiates connection establishment, specifies and set up the data cell of light flexibly (ODUflex) connection meeting G.HAO and require in the signaling message of initiating connection establishment; In each node in service connection path timeslot number required for each link on service connection path, maximum timeslot number reserves resource, connects.The present invention, by expansion control plane signaling protocol, enables to set up and supports that the ODUflex of G.HAO function connects.
Description
Technical field
The present invention relates to communication field, particularly relate to a kind of method and system of connection establishment.
Background technology
The container of the transmission flexibly ODUflex(light data cell flexibly of ITU-T definition), for the carrying of IP operation and in the future business proposes new approaches.The flexibility and changeability rate adaptation mechanism that ODUflex provides, makes OTN(Optical Transport Network, optical transfer network) full-service comprising IP can be carried efficiently, and improve line bandwidth utilance to greatest extent.Current ITU-T defines the ODUflex of two kinds of forms: one is based on CBR(Constant Bit Rate, constant bit-rate) ODUflex of business, speed can be arbitrary, and CBR business is encapsulated into this ODUflex by synchronization map; Another kind is the ODUflex based on Packet Service, and the speed of this ODUflex is N times of HO ODU time slot, and bag business passes through GFP(Generic Framing Procedure, Generic Framing Procedure) be encapsulated into ODUflex.
For ODUflex(GFP), because the bandwidth of client signal of dividing into groups is can be time dependent, think ODUflex(GFP) distribute effective utilization that fixed-bandwidth is unfavorable for bandwidth resources.If ODUflex(GFP) dynamic Bandwidth adjustment can be supported, so not only can meet the various bandwidth requirement of grouping client signal better, and can effectively improve bandwidth availability ratio and save bandwidth resources.For this reason, ODUflex(GFP) just need to possess the ability nondestructively adjusting bandwidth.ODUflex(GFP) harmless adjustment means ODUflex(GFP) needs are when dynamically and complete the adjustment of bandwidth when not interrupting existing business.
Although VCAT(Virtual is Concatenation, Virtual Concatenation)/LCAS(Link Capacity Adjustment Scheme, Link Capacity Adjustment Scheme) also can realize the harmless adjustment of bandwidth, but because VCAT/LCAS implements more complicated in operation and management aspect, manufacturer is seldom had to use in OTN, so need to design a kind of harmless Adjusted Option being applicable to ODUflex.For this reason, ITU-T proposes suggestion G.HAO(Hitless Adjustment of ODUflex (GFP) about harmless Bandwidth adjustment), connect adjustment by LCR(link) and BWR(Bandwidth adjustment) two stages complete the harmless Bandwidth adjustment of ODUflex.
Summary of the invention
Because channel time slot bandwidth of different OTUk links is different, so channel time slot bandwidth of different OPUk is not identical, channel time slot bandwidth of such as high-order OPU2 is 1.249 494 145 Gbps, channel time slot bandwidth of high-order OPU3 is 1.254 728 823 Gbps, and channel time slot bandwidth of high-order OPU4 is 1.301 711 855 Gbps; Therefore ODUflex branch road number of time slots shared by different OPUk is not identical.But the G.HAO standard-required of the ITU-T Q11 interim meeting according in September, 2010, have Bandwidth adjustment ability ODUflex must it process all links on take identical number of time slots, therefore need when signaling, by every bar OTUk link assignment of process identical channel time slot, and there is the ODUflex that bandwidth can't harm adjustment connect in signaling procedure setting up one, point out that this ODUflex connects and has harmless adjustment capability.And the work that control plane is also not relevant at present.
The technical problem to be solved in the present invention proposes a kind of method and system of connection establishment, connects to support to set up the ODUflex possessing G.HAO function.
In order to solve the problem, the invention provides a kind of method of connection establishment, comprising:
The first node of business initiates connection establishment, specifies and set up the data cell of light flexibly (ODUflex) connection meeting G.HAO and require in the signaling message of initiating connection establishment;
In each node in service connection path timeslot number required for each link on service connection path, maximum timeslot number reserves resource, connects.
Preferably, said method has following characteristics:
Described first node is by the speed of computing service bandwidth divided by each link, obtain described maximum timeslot number, or, described maximum timeslot number is obtained from the path computing response message that path-calculating element sends, described maximum timeslot number is carried in the signaling message of described initiation connection establishment, send to downstream node, until send to the tail node of business.
Preferably, said method has following characteristics:
Initiate in the step of connection establishment at described first node,
The control plane of described first node constructs the PATH based on RSVP (RSVP-TE) signaling of Traffic Engineering extensions, the signal type arranging described PATH is ODUflex, and described PATH carries the identification information and described maximum timeslot number of supporting G.HAO function, is sent by the downstream node of described PATH to business.
Preferably, said method has following characteristics:
When the intermediate node of business receives described PATH, forward described PATH further, until send to the tail node of business;
When the tail node of business receives described PATH, reserved (RESV) message of its control plane structure message source, upstream nodes sends, until send to the first node of business;
After described first node receives the RESV message of successful respond, connection establishment success.
Preferably, said method has following characteristics:
After described first node obtains described maximum timeslot number, reserve resource according to described maximum timeslot number in transmission plane; After described intermediate node and tail node receive described PATH, reserve resource according to described maximum timeslot number in transmission plane.
Preferably, said method has following characteristics:
After described tail node receives described PATH, reserve resource according to described maximum timeslot number in transmission plane; After described intermediate node and first node receive described RESV message, reserve resource according to described maximum timeslot number in transmission plane.
Preferably, said method has following characteristics:
The signaling message of described initiation connection establishment sends by described first node to downstream node, until send to the tail node of business, the tail node of described business collects described maximum timeslot number by described signaling message, described maximum timeslot number is carried by response message, upstream nodes sends, until send to described first node;
The maximum timeslot number that each node in service connection path carries according to described response message reserves resource.
Preferably, said method has following characteristics:
Timeslot number required for link-local is carried in the signaling message of described initiation connection establishment by the first node of described business, and the downstream node to business sends;
When the intermediate node of business receives described signaling message, the timeslot number for carrying in the timeslot number of traffic assignments and described signaling message is needed by link-local to compare, if be greater than the timeslot number carried in described signaling message, this timeslot number is then used to replace the timeslot number carried in described signaling message, the described signaling message of further forwarding, if be less than or equal to the timeslot number carried in described signaling message, then directly forward described signaling message, until send to the tail node of business;
When the tail node of business receives described signaling message, the timeslot number for carrying in the timeslot number of traffic assignments and described signaling message is needed by link-local to compare, select wherein larger timeslot number as described maximum timeslot number, be carried in response message, upstream nodes sends, until send to described first node.
Preferably, said method has following characteristics:
The signaling message of described initiation connection establishment is PATH;
Initiate in the step of connection establishment at described first node,
The PATH of the control plane structure RSVP-TE signaling of described first node, the signal type arranging described PATH is ODUflex, and described PATH carries the instruction that the identification information of support G.HAO function, the timeslot number required for link-local and service link distribute identical time slot, is sent by the downstream node of described PATH to business.
Preferably, said method has following characteristics:
Described response message is RESV message;
After described first node receives the RESV message of successful respond, connection establishment success.
In order to solve the problem, the invention provides a kind of system of connection establishment, comprising: comprise all nodes on service connection path, the first node of business comprises connection establishment apparatus for initiating, and each node comprises connection establishment final controlling element;
Described connection establishment apparatus for initiating, for initiating connection establishment, specifying and setting up an ODUflex connection meeting G.HAO and require in the signaling message of initiating connection establishment;
Described connection establishment final controlling element, after initiating connection establishment for described connection establishment apparatus for initiating, in the timeslot number required for each link on service connection path, maximum timeslot number reserves resource, connects.
Preferably, said system has following characteristics:
Described connection establishment apparatus for initiating, be further used for by the speed of computing service bandwidth divided by each link, obtain described maximum timeslot number, or, described maximum timeslot number is obtained from the path computing response message that path-calculating element sends, described maximum timeslot number is carried in the signaling message of described initiation connection establishment, sends to downstream node.
Preferably, in said system, the tail node of business comprises acquisition device,
Described acquisition device, for collecting described maximum timeslot number by described signaling message, carries described maximum timeslot number by response message, and upstream nodes sends;
Described connection establishment final controlling element, the maximum timeslot number being further used for carrying according to described response message reserves resource.
The present invention, by expansion control plane signaling protocol, enables to set up and supports that the ODUflex of G.HAO function connects.
Accompanying drawing explanation
Fig. 1 is a simple network diagram;
Fig. 2 is one and is responsible for the simple network schematic diagram of path computing with PCE.
Embodiment
The present invention, by expansion control plane signaling protocol, enables to set up and supports that the ODUflex of G.HAO function connects.
Particularly, the first node of business initiates connection establishment, specifies and set up an ODUflex connection meeting G.HAO and require in the signaling message of initiating connection establishment;
In each node in service connection path timeslot number required for each link on service connection path, maximum timeslot number reserves resource, connects.
Hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
In embodiments of the invention, following expansion is carried out to RSVP-TE signaling:
1, G.709 Traffic Parameters(flow parameter) expansion:
As shown in table 1, the G.709 Traffic Parameters defined in ietf standard RFC4328 is expanded as follows:
H(G.HAO) bit: in Flags(mark) Field Definition H bit, represent whether support G.HAO function.This bit is only just meaningful when Signal Type is ODUflex.When this value is 1, express support for G.HAO function; When being 0, representing and do not support G.HAO function.
Table 1
2, Attribute Flags TLV(attribute-bit type lengths values) expansion
In LSP_REQUIRED_ATTRIBUTES(label switched path demand properties) in the Attribute Flags TLV that carries of object, new definition Same Number of Time Slot (identical number of time slots, is denoted as a SN) flag bit.When this flag bit value is 1, represent the LSP(label switched path built) process link on require to distribute identical time slot; When being 0, then do not require identical time slot.
In embodiments of the present invention, how each node of business obtains maximum timeslot number, can have two kinds of modes:
mode one,obtain this maximum timeslot number by first node, send other each nodes to by signaling message
Particularly, can in the following way:
First node is by the speed of computing service bandwidth divided by each link, obtain described maximum timeslot number, or, from PCE(Path Computation Element, path-calculating element) obtain described maximum timeslot number in the path computing response message that sends, described maximum timeslot number is carried in the signaling message of described initiation connection establishment, sends to downstream node, until send to the tail node of business.
PCE supplements as to the one of control plane, it is the functional entity being responsible for path computing in network specially, it is based on known network topology structure and constraints, according to PCC(Path Computation Clients, path computing client) request calculate the optimal path that meets constraints.PCEP(Path Computation Element Communication Protocol, path computation element communication protocol) be special communication protocol between PCC and PCE, comprise PCReq(Path Computation Request, path computing request message) and PCRep(Path Computation Reply, path computing response message).When setting up ODUflex and connecting, first path can be calculated by request PCE.Certainly, if request PCE helps, but the first node of business also oneself calculates path.
In an application example, the PATH message of the control plane structure RSVP-TE signaling of described first node, the signal type arranging described PATH message is ODUflex, and described PATH message carries the identification information and described maximum timeslot number of supporting G.HAO function, is sent by the downstream node of described PATH message to business.
When the intermediate node of business receives described PATH message, forward described PATH message further, until send to the tail node of business;
When the tail node of business receives described PATH message, its control plane structure message RESV message, upstream nodes sends, until send to the first node of business;
After described first node receives the RESV message of successful respond, connection establishment success.
If the intermediate node of business or first node, receive the RESV message of unsuccessfully replying, process by the regulation of current control plane agreement, do not need additional extension.
Resource reservation can have two kinds of modes:
(1), after first node obtains described maximum timeslot number, resource is reserved according to described maximum timeslot number in transmission plane; After described intermediate node and tail node receive described PATH message, reserve resource according to described maximum timeslot number in transmission plane;
(2), after tail node receives described PATH message, resource is reserved according to described maximum timeslot number in transmission plane; After described intermediate node and first node receive described RESV message, reserve resource according to described maximum timeslot number in transmission plane.
mode two,by signaling collection mode, tail node obtains this maximum timeslot number, then by response message, sends other each nodes to.
Particularly, can in the following way:
The signaling message of described initiation connection establishment sends by described first node to downstream node, until send to the tail node of business, the tail node of described business collects described maximum timeslot number by described signaling message, described maximum timeslot number is carried by response message, upstream nodes sends, until send to described first node;
The maximum timeslot number that each node in service connection path carries according to described response message reserves resource.
In one embodiment, the timeslot number required for link-local is carried in the signaling message of described initiation connection establishment by the first node of described business, and the downstream node to business sends;
When the intermediate node of business receives described signaling message, the timeslot number for carrying in the timeslot number of traffic assignments and described signaling message is needed by link-local to compare, if be greater than the timeslot number carried in described signaling message, this timeslot number is then used to replace the timeslot number carried in described signaling message, the described signaling message of further forwarding, if be less than or equal to the timeslot number carried in described signaling message, then directly forward described signaling message, until send to the tail node of business;
When the tail node of business receives described signaling message, the timeslot number for carrying in the timeslot number of traffic assignments and described signaling message is needed by link-local to compare, select wherein larger timeslot number as described maximum timeslot number, be carried in response message, upstream nodes sends, until send to described first node.
In an application example, the signaling message of described initiation connection establishment is PATH message;
The PATH message of the control plane structure RSVP-TE signaling of described first node, the signal type arranging described PATH message is ODUflex, and described PATH message carries the instruction that the identification information of support G.HAO function, the timeslot number required for link-local and service link distribute identical time slot, is sent by the downstream node of described PATH message to business.
Described response message is RESV message;
After described first node receives the RESV message of successful respond, connection establishment success.
If the intermediate node of business or first node, receive the RESV message of unsuccessfully replying, process by the regulation of current control plane agreement, do not need additional extension.
The present invention is further illustrated below with concrete application example.
Application example one
Composition graphs 1 illustrates sets up the connection that a bandwidth is the ODUflex of the support G.HAO of 2.5G between node A and node F.Suppose that the route selected is { A, B, C, F}.Below implementation step:
1, according to service bandwidth (2.5G) and link OPU2, OPU4 branch road slot rate, known link AB, CF need 3 channel time slots, link BC needs 2 channel time slots, thus maximum timeslot number is 3.
2, the control plane of node A constructs the PATH message in RSVP-TE signaling, and reserves the resource of 3 time slots in transmission plane.Node A arranges Traffic Parameter in the requsst listed below:
Signal Type is set to ODUflex;
H bit position 1;
The membership that NMC(is re-used) value be set to 3(in this example, by maximum timeslot number write NMC field);
The value of Bit Rate is set to 2.5G;
After PATH message constructing completes, PATH message is sent to Node B by node A.
3, after the control plane of Node B receives above-mentioned PATH message, after parsing the value of Signal Type, H bit, NMC and Bit Rate, reserve the resource of 3 time slots in transmission plane, then forward PATH message to node C.
4, after the control plane of node C receives above-mentioned PATH message, after parsing the value of Signal Type, H bit, NMC and Bit Rate, reserve the resource of 3 time slots in transmission plane, then forward PATH message to node F.
5, after the control plane of node F receives above-mentioned PATH message, after parsing the value of Signal Type, H bit, NMC and Bit Rate, reserve the resource of 3 time slots in transmission plane, then reply RESV message to node C.
6, after node C receives the RESV message of node F, to Node B response RESV message; After Node B receives the RESV message of node C, reply RESV message to node A; After node A receives the RESV message of Node B, connection establishment success.
Application example two
Composition graphs 1 illustrates sets up the connection that a bandwidth is the ODUflex of the support G.HAO of 5G between node A and node F.Suppose that the route selected is { A, D, E, F}.Below implementation step:
1, according to service bandwidth (5G) and link OPU2, OPU3 branch road slot rate, known link AD, EF need 4 channel time slots, link DE needs 5 channel time slots, thus maximum timeslot number is 5.
2, the control plane of node A constructs the PATH message in RSVP-TE signaling, and reserves the resource of 5 time slots in transmission plane.Node A arranges Traffic Parameter in the requsst listed below:
Signal Type is set to ODUflex;
H bit position 1;
The value of NMC is set to 5;
The value of Bit Rate is set to 5G;
After PATH message constructing completes, PATH message is sent to node D by node A.
3, after the control plane of node D receives above-mentioned PATH message, after parsing the value of Signal Type, H bit, NMC and Bit Rate, reserve the resource of 5 time slots in transmission plane, then forward PATH message to node E.
4, after the control plane of node E receives above-mentioned PATH message, after parsing the value of Signal Type, H bit, NMC and Bit Rate, reserve the resource of 5 time slots in transmission plane, then forward PATH message to node F.
5, after the control plane of node F receives above-mentioned PATH message, after parsing the value of Signal Type, H bit, NMC and Bit Rate, reserve the resource of 5 time slots in transmission plane, then reply RESV message to node E.
6, after node E receives the RESV message of node F, RESV message is replied to node D; After node D receives the RESV message of node E, reply RESV message to node A; After node A receives the RESV message of node D, connection establishment success.
Application example three
Composition graphs 2 illustrates sets up the unidirectional connection that a bandwidth is the ODUflex of the support G.HAO of 5G between node A and node F.Suppose that path computing is realized by PCE.Below implementation step:
1, node A is by PCReq message, and the bandwidth of asking PCE to calculate an A to F is that the ODUflex of the support G.HAO function of 5G connects.
2, suppose that the path that PCE selects is that { A, D, E, F}, according to service bandwidth (5G) and link OPU2, OPU3 branch road slot rate, known link AD, EF need 5 channel time slots, link DE needs 4 channel time slots, thus maximum timeslot number is 5.Node A was sent out by PCRep message in this path and maximum branch road timeslot number by PCE.
3, the control plane of node A constructs the PATH message in RSVP-TE signaling.Node A arranges Traffic Parameter in the requsst listed below:
Signal Type is set to ODUflex;
H bit position 1;
The value of NMC is set to 5;
The value of Bit Rate is set to 5G;
After PATH message constructing completes, PATH message is sent to node D by node A.
4, after the control plane of node D receives above-mentioned PATH message, PATH message is given to node E by node D again, and PATH message is given to node F by node E again.
5, after the control plane of node F receives above-mentioned PATH message, after parsing the value of Signal Type, H bit, NMC and Bit Rate, reserve the resource of 5 time slots in transmission plane, then reply RESV message to node E.
6, after node E receives the RESV message of node F, reserve the resource of 5 time slots in transmission plane, then reply RESV message to node D.
7, RESV message is replied to node D; Reserve the resource of 5 time slots in transmission plane, then reply RESV message to node A.
8, after node A receives the RESV message of node D, the resource of 5 time slots is reserved in transmission plane, connection establishment success.
Application example four
Composition graphs 1 illustrates that between node A and node F, to set up a bandwidth is that the ODUflex of the support G.HAO of 2.5G connects, and requires that the mode that maximum timeslot number adopts signaling to collect obtains.Suppose that the route selected is { A, D, E, F}.Below implementation step:
1, according to service bandwidth (5G) and link OPU2, OPU3 branch road slot rate, known link AD, EF need 4 channel time slots, link DE needs 5 channel time slots, thus maximum timeslot number is 5.
2, the control plane of node A constructs the PATH message in RSVP-TE signaling.Owing to link AD needing 4 channel time slots, thus node A arranges Traffic Parameter in the requsst listed below:
Signal Type is set to ODUflex;
H bit position 1;
The value of NMC is set to 4;
The value of Bit Rate is set to 5G;
In addition, in the Attribute Flags TLV that the LSP_REQUIRED_ATTRIBUTES object arranging PATH message carries, SN flag bit is 1, namely represent the LSP that builds process link on require to distribute identical time slot.
After PATH message constructing completes, PATH message is sent to node D by node A.
3, after the control plane of node D receives above-mentioned PATH message, Signal Type, H bit, NMC, Bit Rate and SN is parsed.Owing to link DE needing 5 channel time slots, be greater than the NMC value in PATH message, thus, the value of NMC is being set to 5 by node D in node E forwarding PATH message.
4, after the control plane of node E receives above-mentioned PATH message, Signal Type, H bit, NMC, Bit Rate and SN is parsed.Owing to link EF needing 4 channel time slots, be less than the NMC value in PATH message, thus, node E does not need to revise the NMC value in PATH message.PATH message is transmitted to node F by node E.
5, after the control plane of node F receives above-mentioned PATH message, after parsing Signal Type, H bit, NMC, Bit Rate and SN, reserve the resource of 5 time slots in transmission plane, then reply RESV message (value of the NMC in RESV is set to 5) to node E.
6, after node E receives the RESV message of node F, after parsing corresponding protocol fields, reserve the resource of 5 time slots in transmission plane, then reply RESV message (value of the NMC in RESV is set to 5) to node D.
7, after node D receives the RESV message of node E, after parsing corresponding protocol fields, reserve the resource of 5 time slots in transmission plane, then reply RESV message (value of the NMC in RESV is set to 5) to node A.
8, after node A receives the RESV message of node D, the resource of 5 time slots is reserved in transmission plane, connection establishment success.
Correspondingly, the system of the connection establishment of the embodiment of the present invention, comprising: comprise all nodes on service connection path, it is characterized in that, the first node of business comprises connection establishment apparatus for initiating, and each node comprises connection establishment final controlling element;
Described connection establishment apparatus for initiating, for initiating connection establishment, specifying and setting up an ODUflex connection meeting G.HAO and require in the signaling message of initiating connection establishment;
Described connection establishment final controlling element, after initiating connection establishment for described connection establishment apparatus for initiating, in the timeslot number required for each link on service connection path, maximum timeslot number reserves resource, connects.
Alternatively, described connection establishment apparatus for initiating, be further used for by the speed of computing service bandwidth divided by each link, obtain described maximum timeslot number, or, from the path computing response message that path-calculating element sends, obtain described maximum timeslot number, described maximum timeslot number is carried in the signaling message of described initiation connection establishment, sends to downstream node.
Alternatively, the tail node of business comprises acquisition device,
Described acquisition device, for collecting described maximum timeslot number by described signaling message, carries described maximum timeslot number by response message, and upstream nodes sends;
Described connection establishment final controlling element, the maximum timeslot number being further used for carrying according to described response message reserves resource.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize, and correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a method for connection establishment, comprising:
The first node of business initiates connection establishment, specifies and set up the data cell of light flexibly (ODUflex) connection meeting G.HAO and require in the signaling message of initiating connection establishment;
In each node in service connection path timeslot number required for each link on service connection path, maximum timeslot number reserves resource, connects;
Initiate in the step of connection establishment at described first node,
The control plane of described first node constructs the PATH based on RSVP (RSVP-TE) signaling of Traffic Engineering extensions, the signal type arranging described PATH is ODUflex, and described PATH carries the identification information and described maximum timeslot number of supporting G.HAO function, is sent by the downstream node of described PATH to business; Or,
The signaling message of described initiation connection establishment is PATH; Initiate in the step of connection establishment at described first node, the PATH of the control plane structure RSVP-TE signaling of described first node, the signal type arranging described PATH is ODUflex, and described PATH carries the instruction that the identification information of support G.HAO function, the timeslot number required for link-local and service link distribute identical time slot, is sent by the downstream node of described PATH to business;
Wherein, described RSVP-TE signaling is expanded, comprising:
G.709Traffic the expansion of Parameters flow parameter, is specially: H (G.HAO) bit: define a H bit in Flags identification field, represents whether support G.HAO function, when this value is 1, expresses support for G.HAO function; When being 0, representing and do not support G.HAO function; And,
The expansion of Attribute Flags TLV attribute-bit type lengths values; In this Attribute FlagsTLV, define a Same Number of Time Slot flag bit, when this flag bit value is 1, represent the LSP label switched path built process link on require to distribute identical time slot; When being 0, then do not require to configure identical time slot.
2. the method for claim 1, is characterized in that,
Described first node is by the speed of computing service bandwidth divided by each link, obtain described maximum timeslot number, or, described maximum timeslot number is obtained from the path computing response message that path-calculating element sends, described maximum timeslot number is carried in the signaling message of described initiation connection establishment, send to downstream node, until send to the tail node of business.
3. the method for claim 1, is characterized in that,
When the intermediate node of business receives described PATH, forward described PATH further, until send to the tail node of business;
When the tail node of business receives described PATH, reserved (RESV) message of its control plane structure message source, upstream nodes sends, until send to the first node of business;
After described first node receives the RESV message of successful respond, connection establishment success.
4. method as claimed in claim 3, is characterized in that,
After described first node obtains described maximum timeslot number, reserve resource according to described maximum timeslot number in transmission plane; After described intermediate node and tail node receive described PATH, reserve resource according to described maximum timeslot number in transmission plane.
5. method as claimed in claim 3, is characterized in that,
After described tail node receives described PATH, reserve resource according to described maximum timeslot number in transmission plane; After described intermediate node and first node receive described RESV message, reserve resource according to described maximum timeslot number in transmission plane.
6. the method for claim 1, is characterized in that,
The signaling message of described initiation connection establishment sends by described first node to downstream node, until send to the tail node of business, the tail node of described business collects described maximum timeslot number by described signaling message, described maximum timeslot number is carried by response message, upstream nodes sends, until send to described first node;
The maximum timeslot number that each node in service connection path carries according to described response message reserves resource.
7. method as claimed in claim 6, is characterized in that,
Timeslot number required for link-local is carried in the signaling message of described initiation connection establishment by the first node of described business, and the downstream node to business sends;
When the intermediate node of business receives described signaling message, the timeslot number for carrying in the timeslot number of traffic assignments and described signaling message is needed by link-local to compare, if be greater than the timeslot number carried in described signaling message, this timeslot number is then used to replace the timeslot number carried in described signaling message, the described signaling message of further forwarding, if be less than or equal to the timeslot number carried in described signaling message, then directly forward described signaling message, until send to the tail node of business;
When the tail node of business receives described signaling message, the timeslot number for carrying in the timeslot number of traffic assignments and described signaling message is needed by link-local to compare, select wherein larger timeslot number as described maximum timeslot number, be carried in response message, upstream nodes sends, until send to described first node.
8. method as claimed in claim 7, is characterized in that,
Described response message is RESV message;
After described first node receives the RESV message of successful respond, connection establishment success.
9. a system for connection establishment, comprising: comprise all nodes on service connection path, it is characterized in that, the first node of business comprises connection establishment apparatus for initiating, and each node comprises connection establishment final controlling element;
Described connection establishment apparatus for initiating, for initiating connection establishment, specifying and setting up an ODUflex connection meeting G.HAO and require in the signaling message of initiating connection establishment;
Described connection establishment final controlling element, after initiating connection establishment for described connection establishment apparatus for initiating, in the timeslot number required for each link on service connection path, maximum timeslot number reserves resource, connects;
Described connection establishment apparatus for initiating, also for the control plane of described first node being constructed the PATH based on the RSVP RSVP-TE signaling of Traffic Engineering extensions, the signal type arranging described PATH is ODUflex, and described PATH carries the identification information and described maximum timeslot number of supporting G.HAO function, is sent by the downstream node of described PATH to business; Or,
The signaling message of described initiation connection establishment is PATH; Initiate in the step of connection establishment at described first node, the PATH of the control plane structure RSVP-TE signaling of described first node, the signal type arranging described PATH is ODUflex, and described PATH carries the instruction that the identification information of support G.HAO function, the timeslot number required for link-local and service link distribute identical time slot, is sent by the downstream node of described PATH to business;
Wherein, described RSVP-TE signaling is expanded, comprising:
G.709Traffic the expansion of Parameters flow parameter, is specially: H (G.HAO) bit: define a H bit in Flags identification field, represents whether support G.HAO function, when this value is 1, expresses support for G.HAO function; When being 0, representing and do not support G.HAO function; And,
The expansion of Attribute Flags TLV attribute-bit type lengths values; In this Attribute FlagsTLV, define a Same Number of Time Slot flag bit, when this flag bit value is 1, represent the LSP label switched path built process link on require to distribute identical time slot; When being 0, then do not require to configure identical time slot.
10. system as claimed in claim 9, is characterized in that,
Described connection establishment apparatus for initiating, be further used for by the speed of computing service bandwidth divided by each link, obtain described maximum timeslot number, or, described maximum timeslot number is obtained from the path computing response message that path-calculating element sends, described maximum timeslot number is carried in the signaling message of described initiation connection establishment, sends to downstream node.
11. systems as claimed in claim 9, it is characterized in that, the tail node of business comprises acquisition device,
Described acquisition device, for collecting described maximum timeslot number by described signaling message, carries described maximum timeslot number by response message, and upstream nodes sends;
Described connection establishment final controlling element, the maximum timeslot number being further used for carrying according to described response message reserves resource.
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| CN110601999B (en) * | 2018-06-12 | 2022-03-04 | 华为技术有限公司 | Method and device for reserving resources |
| CN110505112B (en) * | 2019-07-09 | 2021-06-22 | 星融元数据技术(苏州)有限公司 | Network performance monitoring method, device and storage medium |
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| EP2228928A1 (en) * | 2009-03-09 | 2010-09-15 | Alcatel-Lucent Italia S.p.A. | Method for data transmission in an optical transport network |
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| EP2228928A1 (en) * | 2009-03-09 | 2010-09-15 | Alcatel-Lucent Italia S.p.A. | Method for data transmission in an optical transport network |
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